Answer

• You need to know the name of my function. (My function is called ``SOLVE''.)

• You need to know what type of value it returns. (My function returns a REAL result.)

• You need to know the number and types of the arguments. (My function takes two REAL arguments. We'll call the first one ``P'' and the second one ``Q'', although I may have used different names in the actual implementation.)

• You need to know if there are any restrictions on the possible values of the arguments. (My function requires that ``Q'' be nonzero. If the second argument to my function is 0, I can't guarantee anything about what it might do. Buyer beware!)

• You need to know what my function does. (My function returns the solution to the equation given above.)

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